US3621624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Panel wall construction
Assignee: Individual
•
Filing: 1970-04-13
•
Granted: 1971-11-23
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Expires: 1990-04-13
Abstract
Abstract A PLURALITY OF PANELS OF SANDWICH CONSTRUCTION EACH HAVING SPACED WALL ELEMENTS, A CORE AND A PERIPHERAL FRAME BETWEEN THE WALL ELEMENTS. THE FRAME PROVIDES TONGUES AND COOPERATING GROOVES FOR RECEPITION OF THE TONGUES OF ADJACENT PANELS WHEN THE PANELS ARE DISPOSED IN END-TO-END ENGAGEMENT. ANCHORING SCREWS EXTEND THROUGH FRAME PORTIONS OF ADJACENT PANELS TO RELEASABLY LOCK THE PANELS IN WALL FORMING END-TO-END ENGAGEMENT.
Inventors
- 👤 Evert W Gustafson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:39
CPC Classifications
E; E04; E04D; E04D3/00; E04D3/35; E04D3/351; E04D3/352; E04B; E04B7/00; E04B7/20; E04B7/22; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/20; E04C2/205; E04C2/30; E04C2/38; E04C2/384
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |